Arrgh! I joined the 'Bench Stuck in the Bed Position' club over the weekend. Gave the strap a tug, and after the usual 'clunk' - nothing. Cue an hour of frustration trying to get the bench back in it's usual position. Tried moving the bench on the rails, pushing and pulling on the bench back, and even pulled out the multiflex to see if anything was stuck back there.
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I read a few helpful threads on the forum and it was clear something had gone wrong with the bench mechanism, but I wasn't really in a position to start taking it all to bits - besides, it's still under warranty.
So I eventually managed to find the mechanism that keeps the bench locked 'down', and pry it free. I took some photos of the process in hope that it'll be useful to anyone else with a stuck bench!
First, pull up the seat cushion - reach into the gap where the bench release strap comes from and pull up and back toward the driver's seat - the bench cushion will hinge from the front.
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You might need to remove the webbing strap on the right hand (kitchen) side that prevents the bench cushion from fully opening - this is easily done with a short screwdriver with a posidrive bit, or a pair of scissors I suppose.
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When you have the bench cushion up, you will be able to see the slider arms that the bench back slides on to form the bed position - there is one on each side, left and right. At the bottom of each f these slider arms there is a locking latch. It's this locking latch that causes the bench to be stuck in the bed position. It's next to the cross headed screw in the photo below.
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It's possible to slide a medium flat headed screwdriver behind this pin, and move it upward into the slider arm which will enable the bench backrest to move freely again. If it's stiff to move it, put your bodyweight on the bench back (kneel on it) and it should free up the tension on the latch to enable you to move it.
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If you're able to successfully pop the latch upwards toward the screw, then you should hear a 'click' and the bench backrest will able to return to it's 'seat' position again! Phew!
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I hope this is useful, and saves someone else the pain of wondering how to get the bench back into 'seat' mode, after it gets stuck!